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Title Instanton effects in twist-3 generalized parton distributions
Authors Jun-Young Kim, Christian Weiss
JLAB number JLAB-THY-23-3946
LANL number arXiv:2310.16890
Other number DOE/OR/23177-7244
Document Type(s) (Journal Article) 
Associated with EIC: No
Supported by Jefferson Lab LDRD Funding: No
Funding Source: Nuclear Physics (NP)

Compiled for Physics Letters B
Volume 848
Page(s) 138387
Publication Abstract: The instanton vacuum picture is used to study hadronic matrix elements of the twist-3 (dimension-4, spin-1) QCD operators measuring the quark spin density and spin-orbit correlations. The QCD operators are converted to effective operators in the low-energy effective theory emerging after chiral symmetry breaking, in a systematic approach based on the diluteness of the instanton medium and the 1/Nc expansion. The instanton fields induce spin-flavor-dependent "potential" terms in the effective operators, complementing the "kinetic" terms from the quark field momenta. As a result, the effective operators obey the same equation-of-motion relations as the original QCD operators. The spin-orbit correlations are qualitatively different from naive quark model expectations.
Experiment Numbers: other
Document: pdf
Accepted Manuscript: 2310.16890.pdf
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